Bolt-socket for concrete structures.



E. 0. KEMOR.

BOLT SOCKET FOR CONCRETE STRUCTURES APPLICATION FILED ma. '9. i911.

Patented @1530,1918.

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pecieatton of Letters Patent.

J-BLT-SGKET FR (N CRETE STRUCTURES.

ratenteu am. so, raie.

Algip'ltcaticn filed February u, 1917. serial-tto?. Mwtt.

To all 'whom 't may concern:

Be it known that l, EDWARD 10. Kna'ron, a citizen of the United States of America., `and resident of Cincinnati, in the county of Hamilton 'and State of Ohio, have -invented a new and useful Improvement in Bolt- Sockets for Concrete Structures, of which the following is a specication.

An object of my invention is to produce an improved'bolt-soclret for the ceilings of reinforced concrete structures, for the supporting of sprinkler systems and the like which will direct the load to the reinforcement and not to the concrete.

A further object is to produce an improved,

bolt-socket, which, previous to the pouring of the concrete, Will permit of adjacent inserts being more readily located and more securely 'astened against accidental displacement from spaced relation to one another on the supporting formwork of concrete structures in which they are employed, than other bolt-sockets now on the market.

rThese and other objects are attained in the bolt-socket described in the following specification and illustrated inthe. accompanying drawings, in which:

Figure -1 is a perspective view of a .boltsocket'embodying my invention, located on a supporting formwork shown in section and fragmentally, with a bolt located'therein and shownv fragmentally.

Fig. 2 is a longitudinal sectional view ofl my improved bolt-socket with a bolt located therein and shown fragmentally, embedded l, in a concrete Hoor slab.

My improved bolt-socket consists of a hollow cylindrical body portion 3, open at both ends, having flanges 4 at its upper end a smooth exterior below the Hanges, and wlth lugs forming feet 5 at its lower end for supporting it upon theV temporary formwork upon which it is located in spaced relation to other bolt-sockets located thereon. The

interior of the upper end of the bolt-socket is provided with screw threads 6- adapted to receive the screw threaded nut' of a bolt 7 employed for supporting the sprinkler system, shaft hangers and other velements to be attached to the completed structure, the interior of the lower end of the bolt-socket being left plain and somewhat enlarged to receive the shank of the bolt freely. Flanges t at the upper end of the bolt-socket are of such a shape and size as yto extend into 'the concrete surrounding them, suciently to prevent being pulled therefrom, the Hanges being spaced apart a distance sufcient to receive the concrete poured over them and thus `form keys extending into the concrete to prevent withdrawal of the bolt-socket. Above the anges are formed lugs 8, which when the bolt-socket is supplied to the trade, are leftl in their vertical positions. At the time of placing the bolt-socket in the structure, a wooden plug 9 is driven into the upper end thereof and the lugs 8 are bent over the plug to hold it in position as disclosed. To facilitate the placing of the bolt-socket I have omitted the screw threads from the vat right angles to one another, the sides of Y the lugs belng tapered to come toa point 11,

see Fig. 1, for the purpose of permitting the concrete to How under the lugs in order to prevent their being seen in the ceiling of the finished structure when/'the temporary formwork is removed. 'llwo of the lugs `5v are provided with enlarged ends 12 in which openings for thereception of nails 13, are provided. The coperating lugs are left plain, being provided merely for supporting the bolt-socket vertically wit'h relation to the formwork when secured in position thereon as disclosed in Fig. 1.

ln locating the bolt-sockets in position on the temporary formwork, they are placed preferably between adjacent reinforcing rods 14 and 15 of the structure, so that the langes are above the rods, thus the exterior being smooth the load 'isconveyed to the rods and not to the concrete, thus preventing Ibreaking of the' concrete surrounding the bolt-socket., away from thel remaining concrete of the structure. The bolt-socket, in this position, is best adapted to support theload imposed upon .it without. danger of weakening the concrete slab in which it is embedded.- lln removing the'molding formwork, the nails 13 with which the bolt-sockets are held in their upright positions, are left projecting from the surface of the concrete. Since they cannot easily be withrot llllO drawn from the bolt-socket, they are cut off close to the under sides of the lugs 5, as disclosed in Fig. 2. Any roughness left by the nails, is readily covered up by plaster.

vBy means of my improved bolt-socket, the load is placed at a sufficient distance above the ceiling, to prevent fire from effecting the strength of the supporting means. Moreover, the lugs 5 support the concrete about them, in case it becomes dehydrated or otherwise weakened.

Having thus described my invention, what 1 claim is;

1. A bolt socket for concrete structures having lugs extending radially from the lower end7 adapted to support the .bolt socket upon the temporary form work of a concrete structure, said lugs consisting of a series of pairs of lugs, the lugs of each series being located upon diametrically opposite sides of the socket, certain of said lugs being perforated to form sight holes to register the socket accurately with a center line marked on the temporary form work and to receive nails to secure the socket to the temporary form Work, each of others of said lugs having a single `Vshaped under surface adapted to form 'an edge for centering the socket with the single V-shaped edge of each lug on other centering lines on the temporary form work.

2. A bolt socket for concrete structures having internal screw threads at its upper end adapted to retain a bolt therein and external flanges adapted to become embedded in the concrete surrounding the socket, lugs extending radially from the lower end, adapted to support the bolt socket upon the temporary formwork of a concrete structure, said lugs consisting of a series of pairs of lugs, the lugsof each series being located upon diametrically opposite sides of the socket, certain of said lugs being perorated to form sightholes to register the socket accurately with a center line marked on the temporary formwork and to receive nails to secure the socket to the temporary formwork, others of said lugs having V- shaped under surfaces adapted to form edges for centering the socket with other centering lines on the temporary formwork, and a cylindrical portion extending from the lugs to the externally flanged portion, having a hollow interior of larger diameter than the bolt it is to receive.

ln testimony whereof, I have hereunto subscribed my name this 6th day of February, 1917.

EDVARD O. KEATOR. Witnesses:

WALTER F. MURRAY, W. THORNTON BoGER'r. 

